Tank sidewall



FIG. 1 top-front perspective view of a tank sidewall showing the new design;

FIG. 2 is a bottom-rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof, the right side view being a mirror image of the left side view;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

CLAIM The ornamental design for a tank sidewall, as shown and described. 